A kind of method for preparing silica sol

Abstract

The invention relates to a method for preparing silica sol. The method for preparing the silica sol is characterized by comprising the following steps of (1), using a Bayan obo tailing as a raw material, leaching the Baiyunebo tailing by using an inorganic acid, and filtering an obtained mixture to obtain an acid-leached solution and an acid-leached residue; (2), roasting the acid-leached residue for 2h to 6h in a condition of 500 DEG C to 900 DEG C to obtain roasted ore; (3), under the regulation of a regulating agent, slowly adding the roasted ore into a sodium hydroxide solution with mass concentration of 5 to 15 percent, wherein the mass ratio of the roasted ore to the sodium hydroxide solution is 1: 0.3 to 1: 1, a reaction temperature is 60 DEG C to 100 DEG C, a reaction time is 2h to 8h, and a stirring speed is 20gama / min. The prepared silica sol has the advantages that the raw material is the acid-leached residue obtained by carrying out acid leaching on the Bayan obo tailing; silicon content is high; impurities are less; the prepared silica sol is high in purity; a process is scientific and simple; the cost is low; the recovery rate of silicon is up to 95 percent or above 95 percent; no three wastes are generated in a production procedure; meanwhile, rare earth in the tailing can be recovered. The method for preparing the silica sol is not only applicable to the Bayan obo tailing, is but also applicable for other ore deposits with higher silicon content.

Description

technical field [0001] The invention relates to a method for preparing silica sol, which belongs to the field of chemical industry. Background technique [0002] As a fine chemical product, silica sol is widely used in chemical industry, precision casting, papermaking, paint, textile, food, electronics and other fields. Silica sol is the best raw material for preparing catalysts. Using silica sol as the carrier of the catalyst can improve the selectivity of the catalyst and the yield of the product. The use of silica sol instead of water glass as the binder in the casting process of precision devices can change the current situation of poor dimensional accuracy and rough surface quality of castings. Adding silica sol in the papermaking process can make the paper surface smooth, the image clear, and increase its exposure range. Adding silica sol to the paint can form a film with strong pollution resistance and dust resistance, and the water resistance and durability of the ...

AI Technical Summary

Problems solved by technology

The patent with application number CN103395792A studies the method of preparing white carbon black from Baiyun Obo tailings, but it has not been used in actual production so far due to the disadvantages of long process steps, large amount of waste water and high energy consumption.

Images